RFR: 8168295: [JVMCI] -XX:+JVMCIPrintProperties should exit after printing

[Doug Simon]

Please review this small change that fixes an accidental omission from https://bugs.openjdk.java.net/browse/JDK-8167194. The -XX:+JVMCIPrintProperties flag should cause the VM to exit (like the -Djvmci.PrintFlags system property removed by 8167194 used to). Unlike -XX:+PrintFlagsFinal and -XX:+PrintFlagsInitial, it doesn’t make sense to continue execution after printing the help message triggered by -XX:+JVMCIPrintProperties.

Include in this patch is a minor change in the format of the help output to match that of Graal[1]. Instead of:

[JVMCI properties]
  String jvmci.Compiler                = null
         Selects the system compiler.
 Boolean jvmci.InitTimer               = false
         Specifies if initialization timing is enabled.
 Boolean jvmci.PrintConfig             = false
         Prints VM configuration available via JVMCI.
  String jvmci.TraceMethodDataFilter   = null
         Enables tracing of profiling info when read by JVMCI.
         Empty value: trace all methods
         Non-empty value: trace methods whose fully qualified name contains the value.

the output is now:

[JVMCI properties]
jvmci.Compiler = null                                                     [String]
          Selects the system compiler.
jvmci.InitTimer = false                                                  [Boolean]
          Specifies if initialization timing is enabled.
jvmci.PrintConfig = false                                                [Boolean]
          Prints VM configuration available via JVMCI.
jvmci.TraceMethodDataFilter = null                                        [String]
          Enables tracing of profiling info when read by JVMCI.
          Empty value: trace all methods
          Non-empty value: trace methods whose fully qualified name contains the value.

The new format makes it easier to scan the available options since the option name is not aligned with the help message.


http://cr.openjdk.java.net/~dnsimon/8168295/
https://bugs.openjdk.java.net/browse/JDK-8168295

-Doug

[1] https://github.com/graalvm/graal-core/commit/096f2fd304c6937623abc9483fc02862b4fa909e